linux/drivers/usb/gadget/composite.c
Benjamin Herrenschmidt 50b9773c13 usb: gadget: Fix OS descriptors support
The current code is broken as it re-defines "req" inside the
if block, then goto out of it. Thus the request that ends
up being sent is not the one that was populated by the
code in question.

This fixes RNDIS driver autodetect by Windows 10 for me.

The bug was introduced by Chris rework to remove the local
queuing inside the if { } block of the redefined request.

Fixes: 636ba13aec ("usb: gadget: composite: remove duplicated code in OS desc handling")
Cc: <stable@vger.kernel.org> # v4.17
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
2018-07-17 10:12:51 +03:00

2438 lines
64 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* composite.c - infrastructure for Composite USB Gadgets
*
* Copyright (C) 2006-2008 David Brownell
*/
/* #define VERBOSE_DEBUG */
#include <linux/kallsyms.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/utsname.h>
#include <linux/usb/composite.h>
#include <linux/usb/otg.h>
#include <asm/unaligned.h>
#include "u_os_desc.h"
/**
* struct usb_os_string - represents OS String to be reported by a gadget
* @bLength: total length of the entire descritor, always 0x12
* @bDescriptorType: USB_DT_STRING
* @qwSignature: the OS String proper
* @bMS_VendorCode: code used by the host for subsequent requests
* @bPad: not used, must be zero
*/
struct usb_os_string {
__u8 bLength;
__u8 bDescriptorType;
__u8 qwSignature[OS_STRING_QW_SIGN_LEN];
__u8 bMS_VendorCode;
__u8 bPad;
} __packed;
/*
* The code in this file is utility code, used to build a gadget driver
* from one or more "function" drivers, one or more "configuration"
* objects, and a "usb_composite_driver" by gluing them together along
* with the relevant device-wide data.
*/
static struct usb_gadget_strings **get_containers_gs(
struct usb_gadget_string_container *uc)
{
return (struct usb_gadget_strings **)uc->stash;
}
/**
* function_descriptors() - get function descriptors for speed
* @f: the function
* @speed: the speed
*
* Returns the descriptors or NULL if not set.
*/
static struct usb_descriptor_header **
function_descriptors(struct usb_function *f,
enum usb_device_speed speed)
{
struct usb_descriptor_header **descriptors;
/*
* NOTE: we try to help gadget drivers which might not be setting
* max_speed appropriately.
*/
switch (speed) {
case USB_SPEED_SUPER_PLUS:
descriptors = f->ssp_descriptors;
if (descriptors)
break;
/* FALLTHROUGH */
case USB_SPEED_SUPER:
descriptors = f->ss_descriptors;
if (descriptors)
break;
/* FALLTHROUGH */
case USB_SPEED_HIGH:
descriptors = f->hs_descriptors;
if (descriptors)
break;
/* FALLTHROUGH */
default:
descriptors = f->fs_descriptors;
}
/*
* if we can't find any descriptors at all, then this gadget deserves to
* Oops with a NULL pointer dereference
*/
return descriptors;
}
/**
* next_ep_desc() - advance to the next EP descriptor
* @t: currect pointer within descriptor array
*
* Return: next EP descriptor or NULL
*
* Iterate over @t until either EP descriptor found or
* NULL (that indicates end of list) encountered
*/
static struct usb_descriptor_header**
next_ep_desc(struct usb_descriptor_header **t)
{
for (; *t; t++) {
if ((*t)->bDescriptorType == USB_DT_ENDPOINT)
return t;
}
return NULL;
}
/*
* for_each_ep_desc()- iterate over endpoint descriptors in the
* descriptors list
* @start: pointer within descriptor array.
* @ep_desc: endpoint descriptor to use as the loop cursor
*/
#define for_each_ep_desc(start, ep_desc) \
for (ep_desc = next_ep_desc(start); \
ep_desc; ep_desc = next_ep_desc(ep_desc+1))
/**
* config_ep_by_speed() - configures the given endpoint
* according to gadget speed.
* @g: pointer to the gadget
* @f: usb function
* @_ep: the endpoint to configure
*
* Return: error code, 0 on success
*
* This function chooses the right descriptors for a given
* endpoint according to gadget speed and saves it in the
* endpoint desc field. If the endpoint already has a descriptor
* assigned to it - overwrites it with currently corresponding
* descriptor. The endpoint maxpacket field is updated according
* to the chosen descriptor.
* Note: the supplied function should hold all the descriptors
* for supported speeds
*/
int config_ep_by_speed(struct usb_gadget *g,
struct usb_function *f,
struct usb_ep *_ep)
{
struct usb_endpoint_descriptor *chosen_desc = NULL;
struct usb_descriptor_header **speed_desc = NULL;
struct usb_ss_ep_comp_descriptor *comp_desc = NULL;
int want_comp_desc = 0;
struct usb_descriptor_header **d_spd; /* cursor for speed desc */
if (!g || !f || !_ep)
return -EIO;
/* select desired speed */
switch (g->speed) {
case USB_SPEED_SUPER_PLUS:
if (gadget_is_superspeed_plus(g)) {
speed_desc = f->ssp_descriptors;
want_comp_desc = 1;
break;
}
/* fall through */
case USB_SPEED_SUPER:
if (gadget_is_superspeed(g)) {
speed_desc = f->ss_descriptors;
want_comp_desc = 1;
break;
}
/* fall through */
case USB_SPEED_HIGH:
if (gadget_is_dualspeed(g)) {
speed_desc = f->hs_descriptors;
break;
}
/* fall through */
default:
speed_desc = f->fs_descriptors;
}
/* find descriptors */
for_each_ep_desc(speed_desc, d_spd) {
chosen_desc = (struct usb_endpoint_descriptor *)*d_spd;
if (chosen_desc->bEndpointAddress == _ep->address)
goto ep_found;
}
return -EIO;
ep_found:
/* commit results */
_ep->maxpacket = usb_endpoint_maxp(chosen_desc);
_ep->desc = chosen_desc;
_ep->comp_desc = NULL;
_ep->maxburst = 0;
_ep->mult = 1;
if (g->speed == USB_SPEED_HIGH && (usb_endpoint_xfer_isoc(_ep->desc) ||
usb_endpoint_xfer_int(_ep->desc)))
_ep->mult = usb_endpoint_maxp_mult(_ep->desc);
if (!want_comp_desc)
return 0;
/*
* Companion descriptor should follow EP descriptor
* USB 3.0 spec, #9.6.7
*/
comp_desc = (struct usb_ss_ep_comp_descriptor *)*(++d_spd);
if (!comp_desc ||
(comp_desc->bDescriptorType != USB_DT_SS_ENDPOINT_COMP))
return -EIO;
_ep->comp_desc = comp_desc;
if (g->speed >= USB_SPEED_SUPER) {
switch (usb_endpoint_type(_ep->desc)) {
case USB_ENDPOINT_XFER_ISOC:
/* mult: bits 1:0 of bmAttributes */
_ep->mult = (comp_desc->bmAttributes & 0x3) + 1;
/* fall through */
case USB_ENDPOINT_XFER_BULK:
case USB_ENDPOINT_XFER_INT:
_ep->maxburst = comp_desc->bMaxBurst + 1;
break;
default:
if (comp_desc->bMaxBurst != 0) {
struct usb_composite_dev *cdev;
cdev = get_gadget_data(g);
ERROR(cdev, "ep0 bMaxBurst must be 0\n");
}
_ep->maxburst = 1;
break;
}
}
return 0;
}
EXPORT_SYMBOL_GPL(config_ep_by_speed);
/**
* usb_add_function() - add a function to a configuration
* @config: the configuration
* @function: the function being added
* Context: single threaded during gadget setup
*
* After initialization, each configuration must have one or more
* functions added to it. Adding a function involves calling its @bind()
* method to allocate resources such as interface and string identifiers
* and endpoints.
*
* This function returns the value of the function's bind(), which is
* zero for success else a negative errno value.
*/
int usb_add_function(struct usb_configuration *config,
struct usb_function *function)
{
int value = -EINVAL;
DBG(config->cdev, "adding '%s'/%p to config '%s'/%p\n",
function->name, function,
config->label, config);
if (!function->set_alt || !function->disable)
goto done;
function->config = config;
list_add_tail(&function->list, &config->functions);
if (function->bind_deactivated) {
value = usb_function_deactivate(function);
if (value)
goto done;
}
/* REVISIT *require* function->bind? */
if (function->bind) {
value = function->bind(config, function);
if (value < 0) {
list_del(&function->list);
function->config = NULL;
}
} else
value = 0;
/* We allow configurations that don't work at both speeds.
* If we run into a lowspeed Linux system, treat it the same
* as full speed ... it's the function drivers that will need
* to avoid bulk and ISO transfers.
*/
if (!config->fullspeed && function->fs_descriptors)
config->fullspeed = true;
if (!config->highspeed && function->hs_descriptors)
config->highspeed = true;
if (!config->superspeed && function->ss_descriptors)
config->superspeed = true;
if (!config->superspeed_plus && function->ssp_descriptors)
config->superspeed_plus = true;
done:
if (value)
DBG(config->cdev, "adding '%s'/%p --> %d\n",
function->name, function, value);
return value;
}
EXPORT_SYMBOL_GPL(usb_add_function);
void usb_remove_function(struct usb_configuration *c, struct usb_function *f)
{
if (f->disable)
f->disable(f);
bitmap_zero(f->endpoints, 32);
list_del(&f->list);
if (f->unbind)
f->unbind(c, f);
if (f->bind_deactivated)
usb_function_activate(f);
}
EXPORT_SYMBOL_GPL(usb_remove_function);
/**
* usb_function_deactivate - prevent function and gadget enumeration
* @function: the function that isn't yet ready to respond
*
* Blocks response of the gadget driver to host enumeration by
* preventing the data line pullup from being activated. This is
* normally called during @bind() processing to change from the
* initial "ready to respond" state, or when a required resource
* becomes available.
*
* For example, drivers that serve as a passthrough to a userspace
* daemon can block enumeration unless that daemon (such as an OBEX,
* MTP, or print server) is ready to handle host requests.
*
* Not all systems support software control of their USB peripheral
* data pullups.
*
* Returns zero on success, else negative errno.
*/
int usb_function_deactivate(struct usb_function *function)
{
struct usb_composite_dev *cdev = function->config->cdev;
unsigned long flags;
int status = 0;
spin_lock_irqsave(&cdev->lock, flags);
if (cdev->deactivations == 0)
status = usb_gadget_deactivate(cdev->gadget);
if (status == 0)
cdev->deactivations++;
spin_unlock_irqrestore(&cdev->lock, flags);
return status;
}
EXPORT_SYMBOL_GPL(usb_function_deactivate);
/**
* usb_function_activate - allow function and gadget enumeration
* @function: function on which usb_function_activate() was called
*
* Reverses effect of usb_function_deactivate(). If no more functions
* are delaying their activation, the gadget driver will respond to
* host enumeration procedures.
*
* Returns zero on success, else negative errno.
*/
int usb_function_activate(struct usb_function *function)
{
struct usb_composite_dev *cdev = function->config->cdev;
unsigned long flags;
int status = 0;
spin_lock_irqsave(&cdev->lock, flags);
if (WARN_ON(cdev->deactivations == 0))
status = -EINVAL;
else {
cdev->deactivations--;
if (cdev->deactivations == 0)
status = usb_gadget_activate(cdev->gadget);
}
spin_unlock_irqrestore(&cdev->lock, flags);
return status;
}
EXPORT_SYMBOL_GPL(usb_function_activate);
/**
* usb_interface_id() - allocate an unused interface ID
* @config: configuration associated with the interface
* @function: function handling the interface
* Context: single threaded during gadget setup
*
* usb_interface_id() is called from usb_function.bind() callbacks to
* allocate new interface IDs. The function driver will then store that
* ID in interface, association, CDC union, and other descriptors. It
* will also handle any control requests targeted at that interface,
* particularly changing its altsetting via set_alt(). There may
* also be class-specific or vendor-specific requests to handle.
*
* All interface identifier should be allocated using this routine, to
* ensure that for example different functions don't wrongly assign
* different meanings to the same identifier. Note that since interface
* identifiers are configuration-specific, functions used in more than
* one configuration (or more than once in a given configuration) need
* multiple versions of the relevant descriptors.
*
* Returns the interface ID which was allocated; or -ENODEV if no
* more interface IDs can be allocated.
*/
int usb_interface_id(struct usb_configuration *config,
struct usb_function *function)
{
unsigned id = config->next_interface_id;
if (id < MAX_CONFIG_INTERFACES) {
config->interface[id] = function;
config->next_interface_id = id + 1;
return id;
}
return -ENODEV;
}
EXPORT_SYMBOL_GPL(usb_interface_id);
static u8 encode_bMaxPower(enum usb_device_speed speed,
struct usb_configuration *c)
{
unsigned val;
if (c->MaxPower)
val = c->MaxPower;
else
val = CONFIG_USB_GADGET_VBUS_DRAW;
if (!val)
return 0;
switch (speed) {
case USB_SPEED_SUPER:
return DIV_ROUND_UP(val, 8);
default:
return DIV_ROUND_UP(val, 2);
}
}
static int config_buf(struct usb_configuration *config,
enum usb_device_speed speed, void *buf, u8 type)
{
struct usb_config_descriptor *c = buf;
void *next = buf + USB_DT_CONFIG_SIZE;
int len;
struct usb_function *f;
int status;
len = USB_COMP_EP0_BUFSIZ - USB_DT_CONFIG_SIZE;
/* write the config descriptor */
c = buf;
c->bLength = USB_DT_CONFIG_SIZE;
c->bDescriptorType = type;
/* wTotalLength is written later */
c->bNumInterfaces = config->next_interface_id;
c->bConfigurationValue = config->bConfigurationValue;
c->iConfiguration = config->iConfiguration;
c->bmAttributes = USB_CONFIG_ATT_ONE | config->bmAttributes;
c->bMaxPower = encode_bMaxPower(speed, config);
/* There may be e.g. OTG descriptors */
if (config->descriptors) {
status = usb_descriptor_fillbuf(next, len,
config->descriptors);
if (status < 0)
return status;
len -= status;
next += status;
}
/* add each function's descriptors */
list_for_each_entry(f, &config->functions, list) {
struct usb_descriptor_header **descriptors;
descriptors = function_descriptors(f, speed);
if (!descriptors)
continue;
status = usb_descriptor_fillbuf(next, len,
(const struct usb_descriptor_header **) descriptors);
if (status < 0)
return status;
len -= status;
next += status;
}
len = next - buf;
c->wTotalLength = cpu_to_le16(len);
return len;
}
static int config_desc(struct usb_composite_dev *cdev, unsigned w_value)
{
struct usb_gadget *gadget = cdev->gadget;
struct usb_configuration *c;
struct list_head *pos;
u8 type = w_value >> 8;
enum usb_device_speed speed = USB_SPEED_UNKNOWN;
if (gadget->speed >= USB_SPEED_SUPER)
speed = gadget->speed;
else if (gadget_is_dualspeed(gadget)) {
int hs = 0;
if (gadget->speed == USB_SPEED_HIGH)
hs = 1;
if (type == USB_DT_OTHER_SPEED_CONFIG)
hs = !hs;
if (hs)
speed = USB_SPEED_HIGH;
}
/* This is a lookup by config *INDEX* */
w_value &= 0xff;
pos = &cdev->configs;
c = cdev->os_desc_config;
if (c)
goto check_config;
while ((pos = pos->next) != &cdev->configs) {
c = list_entry(pos, typeof(*c), list);
/* skip OS Descriptors config which is handled separately */
if (c == cdev->os_desc_config)
continue;
check_config:
/* ignore configs that won't work at this speed */
switch (speed) {
case USB_SPEED_SUPER_PLUS:
if (!c->superspeed_plus)
continue;
break;
case USB_SPEED_SUPER:
if (!c->superspeed)
continue;
break;
case USB_SPEED_HIGH:
if (!c->highspeed)
continue;
break;
default:
if (!c->fullspeed)
continue;
}
if (w_value == 0)
return config_buf(c, speed, cdev->req->buf, type);
w_value--;
}
return -EINVAL;
}
static int count_configs(struct usb_composite_dev *cdev, unsigned type)
{
struct usb_gadget *gadget = cdev->gadget;
struct usb_configuration *c;
unsigned count = 0;
int hs = 0;
int ss = 0;
int ssp = 0;
if (gadget_is_dualspeed(gadget)) {
if (gadget->speed == USB_SPEED_HIGH)
hs = 1;
if (gadget->speed == USB_SPEED_SUPER)
ss = 1;
if (gadget->speed == USB_SPEED_SUPER_PLUS)
ssp = 1;
if (type == USB_DT_DEVICE_QUALIFIER)
hs = !hs;
}
list_for_each_entry(c, &cdev->configs, list) {
/* ignore configs that won't work at this speed */
if (ssp) {
if (!c->superspeed_plus)
continue;
} else if (ss) {
if (!c->superspeed)
continue;
} else if (hs) {
if (!c->highspeed)
continue;
} else {
if (!c->fullspeed)
continue;
}
count++;
}
return count;
}
/**
* bos_desc() - prepares the BOS descriptor.
* @cdev: pointer to usb_composite device to generate the bos
* descriptor for
*
* This function generates the BOS (Binary Device Object)
* descriptor and its device capabilities descriptors. The BOS
* descriptor should be supported by a SuperSpeed device.
*/
static int bos_desc(struct usb_composite_dev *cdev)
{
struct usb_ext_cap_descriptor *usb_ext;
struct usb_dcd_config_params dcd_config_params;
struct usb_bos_descriptor *bos = cdev->req->buf;
bos->bLength = USB_DT_BOS_SIZE;
bos->bDescriptorType = USB_DT_BOS;
bos->wTotalLength = cpu_to_le16(USB_DT_BOS_SIZE);
bos->bNumDeviceCaps = 0;
/*
* A SuperSpeed device shall include the USB2.0 extension descriptor
* and shall support LPM when operating in USB2.0 HS mode.
*/
usb_ext = cdev->req->buf + le16_to_cpu(bos->wTotalLength);
bos->bNumDeviceCaps++;
le16_add_cpu(&bos->wTotalLength, USB_DT_USB_EXT_CAP_SIZE);
usb_ext->bLength = USB_DT_USB_EXT_CAP_SIZE;
usb_ext->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
usb_ext->bDevCapabilityType = USB_CAP_TYPE_EXT;
usb_ext->bmAttributes = cpu_to_le32(USB_LPM_SUPPORT | USB_BESL_SUPPORT);
/*
* The Superspeed USB Capability descriptor shall be implemented by all
* SuperSpeed devices.
*/
if (gadget_is_superspeed(cdev->gadget)) {
struct usb_ss_cap_descriptor *ss_cap;
ss_cap = cdev->req->buf + le16_to_cpu(bos->wTotalLength);
bos->bNumDeviceCaps++;
le16_add_cpu(&bos->wTotalLength, USB_DT_USB_SS_CAP_SIZE);
ss_cap->bLength = USB_DT_USB_SS_CAP_SIZE;
ss_cap->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
ss_cap->bDevCapabilityType = USB_SS_CAP_TYPE;
ss_cap->bmAttributes = 0; /* LTM is not supported yet */
ss_cap->wSpeedSupported = cpu_to_le16(USB_LOW_SPEED_OPERATION |
USB_FULL_SPEED_OPERATION |
USB_HIGH_SPEED_OPERATION |
USB_5GBPS_OPERATION);
ss_cap->bFunctionalitySupport = USB_LOW_SPEED_OPERATION;
/* Get Controller configuration */
if (cdev->gadget->ops->get_config_params) {
cdev->gadget->ops->get_config_params(
&dcd_config_params);
} else {
dcd_config_params.bU1devExitLat =
USB_DEFAULT_U1_DEV_EXIT_LAT;
dcd_config_params.bU2DevExitLat =
cpu_to_le16(USB_DEFAULT_U2_DEV_EXIT_LAT);
}
ss_cap->bU1devExitLat = dcd_config_params.bU1devExitLat;
ss_cap->bU2DevExitLat = dcd_config_params.bU2DevExitLat;
}
/* The SuperSpeedPlus USB Device Capability descriptor */
if (gadget_is_superspeed_plus(cdev->gadget)) {
struct usb_ssp_cap_descriptor *ssp_cap;
ssp_cap = cdev->req->buf + le16_to_cpu(bos->wTotalLength);
bos->bNumDeviceCaps++;
/*
* Report typical values.
*/
le16_add_cpu(&bos->wTotalLength, USB_DT_USB_SSP_CAP_SIZE(1));
ssp_cap->bLength = USB_DT_USB_SSP_CAP_SIZE(1);
ssp_cap->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
ssp_cap->bDevCapabilityType = USB_SSP_CAP_TYPE;
ssp_cap->bReserved = 0;
ssp_cap->wReserved = 0;
/* SSAC = 1 (2 attributes) */
ssp_cap->bmAttributes = cpu_to_le32(1);
/* Min RX/TX Lane Count = 1 */
ssp_cap->wFunctionalitySupport =
cpu_to_le16((1 << 8) | (1 << 12));
/*
* bmSublinkSpeedAttr[0]:
* ST = Symmetric, RX
* LSE = 3 (Gbps)
* LP = 1 (SuperSpeedPlus)
* LSM = 10 (10 Gbps)
*/
ssp_cap->bmSublinkSpeedAttr[0] =
cpu_to_le32((3 << 4) | (1 << 14) | (0xa << 16));
/*
* bmSublinkSpeedAttr[1] =
* ST = Symmetric, TX
* LSE = 3 (Gbps)
* LP = 1 (SuperSpeedPlus)
* LSM = 10 (10 Gbps)
*/
ssp_cap->bmSublinkSpeedAttr[1] =
cpu_to_le32((3 << 4) | (1 << 14) |
(0xa << 16) | (1 << 7));
}
return le16_to_cpu(bos->wTotalLength);
}
static void device_qual(struct usb_composite_dev *cdev)
{
struct usb_qualifier_descriptor *qual = cdev->req->buf;
qual->bLength = sizeof(*qual);
qual->bDescriptorType = USB_DT_DEVICE_QUALIFIER;
/* POLICY: same bcdUSB and device type info at both speeds */
qual->bcdUSB = cdev->desc.bcdUSB;
qual->bDeviceClass = cdev->desc.bDeviceClass;
qual->bDeviceSubClass = cdev->desc.bDeviceSubClass;
qual->bDeviceProtocol = cdev->desc.bDeviceProtocol;
/* ASSUME same EP0 fifo size at both speeds */
qual->bMaxPacketSize0 = cdev->gadget->ep0->maxpacket;
qual->bNumConfigurations = count_configs(cdev, USB_DT_DEVICE_QUALIFIER);
qual->bRESERVED = 0;
}
/*-------------------------------------------------------------------------*/
static void reset_config(struct usb_composite_dev *cdev)
{
struct usb_function *f;
DBG(cdev, "reset config\n");
list_for_each_entry(f, &cdev->config->functions, list) {
if (f->disable)
f->disable(f);
bitmap_zero(f->endpoints, 32);
}
cdev->config = NULL;
cdev->delayed_status = 0;
}
static int set_config(struct usb_composite_dev *cdev,
const struct usb_ctrlrequest *ctrl, unsigned number)
{
struct usb_gadget *gadget = cdev->gadget;
struct usb_configuration *c = NULL;
int result = -EINVAL;
unsigned power = gadget_is_otg(gadget) ? 8 : 100;
int tmp;
if (number) {
list_for_each_entry(c, &cdev->configs, list) {
if (c->bConfigurationValue == number) {
/*
* We disable the FDs of the previous
* configuration only if the new configuration
* is a valid one
*/
if (cdev->config)
reset_config(cdev);
result = 0;
break;
}
}
if (result < 0)
goto done;
} else { /* Zero configuration value - need to reset the config */
if (cdev->config)
reset_config(cdev);
result = 0;
}
INFO(cdev, "%s config #%d: %s\n",
usb_speed_string(gadget->speed),
number, c ? c->label : "unconfigured");
if (!c)
goto done;
usb_gadget_set_state(gadget, USB_STATE_CONFIGURED);
cdev->config = c;
/* Initialize all interfaces by setting them to altsetting zero. */
for (tmp = 0; tmp < MAX_CONFIG_INTERFACES; tmp++) {
struct usb_function *f = c->interface[tmp];
struct usb_descriptor_header **descriptors;
if (!f)
break;
/*
* Record which endpoints are used by the function. This is used
* to dispatch control requests targeted at that endpoint to the
* function's setup callback instead of the current
* configuration's setup callback.
*/
descriptors = function_descriptors(f, gadget->speed);
for (; *descriptors; ++descriptors) {
struct usb_endpoint_descriptor *ep;
int addr;
if ((*descriptors)->bDescriptorType != USB_DT_ENDPOINT)
continue;
ep = (struct usb_endpoint_descriptor *)*descriptors;
addr = ((ep->bEndpointAddress & 0x80) >> 3)
| (ep->bEndpointAddress & 0x0f);
set_bit(addr, f->endpoints);
}
result = f->set_alt(f, tmp, 0);
if (result < 0) {
DBG(cdev, "interface %d (%s/%p) alt 0 --> %d\n",
tmp, f->name, f, result);
reset_config(cdev);
goto done;
}
if (result == USB_GADGET_DELAYED_STATUS) {
DBG(cdev,
"%s: interface %d (%s) requested delayed status\n",
__func__, tmp, f->name);
cdev->delayed_status++;
DBG(cdev, "delayed_status count %d\n",
cdev->delayed_status);
}
}
/* when we return, be sure our power usage is valid */
power = c->MaxPower ? c->MaxPower : CONFIG_USB_GADGET_VBUS_DRAW;
done:
usb_gadget_vbus_draw(gadget, power);
if (result >= 0 && cdev->delayed_status)
result = USB_GADGET_DELAYED_STATUS;
return result;
}
int usb_add_config_only(struct usb_composite_dev *cdev,
struct usb_configuration *config)
{
struct usb_configuration *c;
if (!config->bConfigurationValue)
return -EINVAL;
/* Prevent duplicate configuration identifiers */
list_for_each_entry(c, &cdev->configs, list) {
if (c->bConfigurationValue == config->bConfigurationValue)
return -EBUSY;
}
config->cdev = cdev;
list_add_tail(&config->list, &cdev->configs);
INIT_LIST_HEAD(&config->functions);
config->next_interface_id = 0;
memset(config->interface, 0, sizeof(config->interface));
return 0;
}
EXPORT_SYMBOL_GPL(usb_add_config_only);
/**
* usb_add_config() - add a configuration to a device.
* @cdev: wraps the USB gadget
* @config: the configuration, with bConfigurationValue assigned
* @bind: the configuration's bind function
* Context: single threaded during gadget setup
*
* One of the main tasks of a composite @bind() routine is to
* add each of the configurations it supports, using this routine.
*
* This function returns the value of the configuration's @bind(), which
* is zero for success else a negative errno value. Binding configurations
* assigns global resources including string IDs, and per-configuration
* resources such as interface IDs and endpoints.
*/
int usb_add_config(struct usb_composite_dev *cdev,
struct usb_configuration *config,
int (*bind)(struct usb_configuration *))
{
int status = -EINVAL;
if (!bind)
goto done;
DBG(cdev, "adding config #%u '%s'/%p\n",
config->bConfigurationValue,
config->label, config);
status = usb_add_config_only(cdev, config);
if (status)
goto done;
status = bind(config);
if (status < 0) {
while (!list_empty(&config->functions)) {
struct usb_function *f;
f = list_first_entry(&config->functions,
struct usb_function, list);
list_del(&f->list);
if (f->unbind) {
DBG(cdev, "unbind function '%s'/%p\n",
f->name, f);
f->unbind(config, f);
/* may free memory for "f" */
}
}
list_del(&config->list);
config->cdev = NULL;
} else {
unsigned i;
DBG(cdev, "cfg %d/%p speeds:%s%s%s%s\n",
config->bConfigurationValue, config,
config->superspeed_plus ? " superplus" : "",
config->superspeed ? " super" : "",
config->highspeed ? " high" : "",
config->fullspeed
? (gadget_is_dualspeed(cdev->gadget)
? " full"
: " full/low")
: "");
for (i = 0; i < MAX_CONFIG_INTERFACES; i++) {
struct usb_function *f = config->interface[i];
if (!f)
continue;
DBG(cdev, " interface %d = %s/%p\n",
i, f->name, f);
}
}
/* set_alt(), or next bind(), sets up ep->claimed as needed */
usb_ep_autoconfig_reset(cdev->gadget);
done:
if (status)
DBG(cdev, "added config '%s'/%u --> %d\n", config->label,
config->bConfigurationValue, status);
return status;
}
EXPORT_SYMBOL_GPL(usb_add_config);
static void remove_config(struct usb_composite_dev *cdev,
struct usb_configuration *config)
{
while (!list_empty(&config->functions)) {
struct usb_function *f;
f = list_first_entry(&config->functions,
struct usb_function, list);
usb_remove_function(config, f);
}
list_del(&config->list);
if (config->unbind) {
DBG(cdev, "unbind config '%s'/%p\n", config->label, config);
config->unbind(config);
/* may free memory for "c" */
}
}
/**
* usb_remove_config() - remove a configuration from a device.
* @cdev: wraps the USB gadget
* @config: the configuration
*
* Drivers must call usb_gadget_disconnect before calling this function
* to disconnect the device from the host and make sure the host will not
* try to enumerate the device while we are changing the config list.
*/
void usb_remove_config(struct usb_composite_dev *cdev,
struct usb_configuration *config)
{
unsigned long flags;
spin_lock_irqsave(&cdev->lock, flags);
if (cdev->config == config)
reset_config(cdev);
spin_unlock_irqrestore(&cdev->lock, flags);
remove_config(cdev, config);
}
/*-------------------------------------------------------------------------*/
/* We support strings in multiple languages ... string descriptor zero
* says which languages are supported. The typical case will be that
* only one language (probably English) is used, with i18n handled on
* the host side.
*/
static void collect_langs(struct usb_gadget_strings **sp, __le16 *buf)
{
const struct usb_gadget_strings *s;
__le16 language;
__le16 *tmp;
while (*sp) {
s = *sp;
language = cpu_to_le16(s->language);
for (tmp = buf; *tmp && tmp < &buf[126]; tmp++) {
if (*tmp == language)
goto repeat;
}
*tmp++ = language;
repeat:
sp++;
}
}
static int lookup_string(
struct usb_gadget_strings **sp,
void *buf,
u16 language,
int id
)
{
struct usb_gadget_strings *s;
int value;
while (*sp) {
s = *sp++;
if (s->language != language)
continue;
value = usb_gadget_get_string(s, id, buf);
if (value > 0)
return value;
}
return -EINVAL;
}
static int get_string(struct usb_composite_dev *cdev,
void *buf, u16 language, int id)
{
struct usb_composite_driver *composite = cdev->driver;
struct usb_gadget_string_container *uc;
struct usb_configuration *c;
struct usb_function *f;
int len;
/* Yes, not only is USB's i18n support probably more than most
* folk will ever care about ... also, it's all supported here.
* (Except for UTF8 support for Unicode's "Astral Planes".)
*/
/* 0 == report all available language codes */
if (id == 0) {
struct usb_string_descriptor *s = buf;
struct usb_gadget_strings **sp;
memset(s, 0, 256);
s->bDescriptorType = USB_DT_STRING;
sp = composite->strings;
if (sp)
collect_langs(sp, s->wData);
list_for_each_entry(c, &cdev->configs, list) {
sp = c->strings;
if (sp)
collect_langs(sp, s->wData);
list_for_each_entry(f, &c->functions, list) {
sp = f->strings;
if (sp)
collect_langs(sp, s->wData);
}
}
list_for_each_entry(uc, &cdev->gstrings, list) {
struct usb_gadget_strings **sp;
sp = get_containers_gs(uc);
collect_langs(sp, s->wData);
}
for (len = 0; len <= 126 && s->wData[len]; len++)
continue;
if (!len)
return -EINVAL;
s->bLength = 2 * (len + 1);
return s->bLength;
}
if (cdev->use_os_string && language == 0 && id == OS_STRING_IDX) {
struct usb_os_string *b = buf;
b->bLength = sizeof(*b);
b->bDescriptorType = USB_DT_STRING;
compiletime_assert(
sizeof(b->qwSignature) == sizeof(cdev->qw_sign),
"qwSignature size must be equal to qw_sign");
memcpy(&b->qwSignature, cdev->qw_sign, sizeof(b->qwSignature));
b->bMS_VendorCode = cdev->b_vendor_code;
b->bPad = 0;
return sizeof(*b);
}
list_for_each_entry(uc, &cdev->gstrings, list) {
struct usb_gadget_strings **sp;
sp = get_containers_gs(uc);
len = lookup_string(sp, buf, language, id);
if (len > 0)
return len;
}
/* String IDs are device-scoped, so we look up each string
* table we're told about. These lookups are infrequent;
* simpler-is-better here.
*/
if (composite->strings) {
len = lookup_string(composite->strings, buf, language, id);
if (len > 0)
return len;
}
list_for_each_entry(c, &cdev->configs, list) {
if (c->strings) {
len = lookup_string(c->strings, buf, language, id);
if (len > 0)
return len;
}
list_for_each_entry(f, &c->functions, list) {
if (!f->strings)
continue;
len = lookup_string(f->strings, buf, language, id);
if (len > 0)
return len;
}
}
return -EINVAL;
}
/**
* usb_string_id() - allocate an unused string ID
* @cdev: the device whose string descriptor IDs are being allocated
* Context: single threaded during gadget setup
*
* @usb_string_id() is called from bind() callbacks to allocate
* string IDs. Drivers for functions, configurations, or gadgets will
* then store that ID in the appropriate descriptors and string table.
*
* All string identifier should be allocated using this,
* @usb_string_ids_tab() or @usb_string_ids_n() routine, to ensure
* that for example different functions don't wrongly assign different
* meanings to the same identifier.
*/
int usb_string_id(struct usb_composite_dev *cdev)
{
if (cdev->next_string_id < 254) {
/* string id 0 is reserved by USB spec for list of
* supported languages */
/* 255 reserved as well? -- mina86 */
cdev->next_string_id++;
return cdev->next_string_id;
}
return -ENODEV;
}
EXPORT_SYMBOL_GPL(usb_string_id);
/**
* usb_string_ids() - allocate unused string IDs in batch
* @cdev: the device whose string descriptor IDs are being allocated
* @str: an array of usb_string objects to assign numbers to
* Context: single threaded during gadget setup
*
* @usb_string_ids() is called from bind() callbacks to allocate
* string IDs. Drivers for functions, configurations, or gadgets will
* then copy IDs from the string table to the appropriate descriptors
* and string table for other languages.
*
* All string identifier should be allocated using this,
* @usb_string_id() or @usb_string_ids_n() routine, to ensure that for
* example different functions don't wrongly assign different meanings
* to the same identifier.
*/
int usb_string_ids_tab(struct usb_composite_dev *cdev, struct usb_string *str)
{
int next = cdev->next_string_id;
for (; str->s; ++str) {
if (unlikely(next >= 254))
return -ENODEV;
str->id = ++next;
}
cdev->next_string_id = next;
return 0;
}
EXPORT_SYMBOL_GPL(usb_string_ids_tab);
static struct usb_gadget_string_container *copy_gadget_strings(
struct usb_gadget_strings **sp, unsigned n_gstrings,
unsigned n_strings)
{
struct usb_gadget_string_container *uc;
struct usb_gadget_strings **gs_array;
struct usb_gadget_strings *gs;
struct usb_string *s;
unsigned mem;
unsigned n_gs;
unsigned n_s;
void *stash;
mem = sizeof(*uc);
mem += sizeof(void *) * (n_gstrings + 1);
mem += sizeof(struct usb_gadget_strings) * n_gstrings;
mem += sizeof(struct usb_string) * (n_strings + 1) * (n_gstrings);
uc = kmalloc(mem, GFP_KERNEL);
if (!uc)
return ERR_PTR(-ENOMEM);
gs_array = get_containers_gs(uc);
stash = uc->stash;
stash += sizeof(void *) * (n_gstrings + 1);
for (n_gs = 0; n_gs < n_gstrings; n_gs++) {
struct usb_string *org_s;
gs_array[n_gs] = stash;
gs = gs_array[n_gs];
stash += sizeof(struct usb_gadget_strings);
gs->language = sp[n_gs]->language;
gs->strings = stash;
org_s = sp[n_gs]->strings;
for (n_s = 0; n_s < n_strings; n_s++) {
s = stash;
stash += sizeof(struct usb_string);
if (org_s->s)
s->s = org_s->s;
else
s->s = "";
org_s++;
}
s = stash;
s->s = NULL;
stash += sizeof(struct usb_string);
}
gs_array[n_gs] = NULL;
return uc;
}
/**
* usb_gstrings_attach() - attach gadget strings to a cdev and assign ids
* @cdev: the device whose string descriptor IDs are being allocated
* and attached.
* @sp: an array of usb_gadget_strings to attach.
* @n_strings: number of entries in each usb_strings array (sp[]->strings)
*
* This function will create a deep copy of usb_gadget_strings and usb_string
* and attach it to the cdev. The actual string (usb_string.s) will not be
* copied but only a referenced will be made. The struct usb_gadget_strings
* array may contain multiple languages and should be NULL terminated.
* The ->language pointer of each struct usb_gadget_strings has to contain the
* same amount of entries.
* For instance: sp[0] is en-US, sp[1] is es-ES. It is expected that the first
* usb_string entry of es-ES contains the translation of the first usb_string
* entry of en-US. Therefore both entries become the same id assign.
*/
struct usb_string *usb_gstrings_attach(struct usb_composite_dev *cdev,
struct usb_gadget_strings **sp, unsigned n_strings)
{
struct usb_gadget_string_container *uc;
struct usb_gadget_strings **n_gs;
unsigned n_gstrings = 0;
unsigned i;
int ret;
for (i = 0; sp[i]; i++)
n_gstrings++;
if (!n_gstrings)
return ERR_PTR(-EINVAL);
uc = copy_gadget_strings(sp, n_gstrings, n_strings);
if (IS_ERR(uc))
return ERR_CAST(uc);
n_gs = get_containers_gs(uc);
ret = usb_string_ids_tab(cdev, n_gs[0]->strings);
if (ret)
goto err;
for (i = 1; i < n_gstrings; i++) {
struct usb_string *m_s;
struct usb_string *s;
unsigned n;
m_s = n_gs[0]->strings;
s = n_gs[i]->strings;
for (n = 0; n < n_strings; n++) {
s->id = m_s->id;
s++;
m_s++;
}
}
list_add_tail(&uc->list, &cdev->gstrings);
return n_gs[0]->strings;
err:
kfree(uc);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(usb_gstrings_attach);
/**
* usb_string_ids_n() - allocate unused string IDs in batch
* @c: the device whose string descriptor IDs are being allocated
* @n: number of string IDs to allocate
* Context: single threaded during gadget setup
*
* Returns the first requested ID. This ID and next @n-1 IDs are now
* valid IDs. At least provided that @n is non-zero because if it
* is, returns last requested ID which is now very useful information.
*
* @usb_string_ids_n() is called from bind() callbacks to allocate
* string IDs. Drivers for functions, configurations, or gadgets will
* then store that ID in the appropriate descriptors and string table.
*
* All string identifier should be allocated using this,
* @usb_string_id() or @usb_string_ids_n() routine, to ensure that for
* example different functions don't wrongly assign different meanings
* to the same identifier.
*/
int usb_string_ids_n(struct usb_composite_dev *c, unsigned n)
{
unsigned next = c->next_string_id;
if (unlikely(n > 254 || (unsigned)next + n > 254))
return -ENODEV;
c->next_string_id += n;
return next + 1;
}
EXPORT_SYMBOL_GPL(usb_string_ids_n);
/*-------------------------------------------------------------------------*/
static void composite_setup_complete(struct usb_ep *ep, struct usb_request *req)
{
struct usb_composite_dev *cdev;
if (req->status || req->actual != req->length)
DBG((struct usb_composite_dev *) ep->driver_data,
"setup complete --> %d, %d/%d\n",
req->status, req->actual, req->length);
/*
* REVIST The same ep0 requests are shared with function drivers
* so they don't have to maintain the same ->complete() stubs.
*
* Because of that, we need to check for the validity of ->context
* here, even though we know we've set it to something useful.
*/
if (!req->context)
return;
cdev = req->context;
if (cdev->req == req)
cdev->setup_pending = false;
else if (cdev->os_desc_req == req)
cdev->os_desc_pending = false;
else
WARN(1, "unknown request %p\n", req);
}
static int composite_ep0_queue(struct usb_composite_dev *cdev,
struct usb_request *req, gfp_t gfp_flags)
{
int ret;
ret = usb_ep_queue(cdev->gadget->ep0, req, gfp_flags);
if (ret == 0) {
if (cdev->req == req)
cdev->setup_pending = true;
else if (cdev->os_desc_req == req)
cdev->os_desc_pending = true;
else
WARN(1, "unknown request %p\n", req);
}
return ret;
}
static int count_ext_compat(struct usb_configuration *c)
{
int i, res;
res = 0;
for (i = 0; i < c->next_interface_id; ++i) {
struct usb_function *f;
int j;
f = c->interface[i];
for (j = 0; j < f->os_desc_n; ++j) {
struct usb_os_desc *d;
if (i != f->os_desc_table[j].if_id)
continue;
d = f->os_desc_table[j].os_desc;
if (d && d->ext_compat_id)
++res;
}
}
BUG_ON(res > 255);
return res;
}
static int fill_ext_compat(struct usb_configuration *c, u8 *buf)
{
int i, count;
count = 16;
buf += 16;
for (i = 0; i < c->next_interface_id; ++i) {
struct usb_function *f;
int j;
f = c->interface[i];
for (j = 0; j < f->os_desc_n; ++j) {
struct usb_os_desc *d;
if (i != f->os_desc_table[j].if_id)
continue;
d = f->os_desc_table[j].os_desc;
if (d && d->ext_compat_id) {
*buf++ = i;
*buf++ = 0x01;
memcpy(buf, d->ext_compat_id, 16);
buf += 22;
} else {
++buf;
*buf = 0x01;
buf += 23;
}
count += 24;
if (count + 24 >= USB_COMP_EP0_OS_DESC_BUFSIZ)
return count;
}
}
return count;
}
static int count_ext_prop(struct usb_configuration *c, int interface)
{
struct usb_function *f;
int j;
f = c->interface[interface];
for (j = 0; j < f->os_desc_n; ++j) {
struct usb_os_desc *d;
if (interface != f->os_desc_table[j].if_id)
continue;
d = f->os_desc_table[j].os_desc;
if (d && d->ext_compat_id)
return d->ext_prop_count;
}
return 0;
}
static int len_ext_prop(struct usb_configuration *c, int interface)
{
struct usb_function *f;
struct usb_os_desc *d;
int j, res;
res = 10; /* header length */
f = c->interface[interface];
for (j = 0; j < f->os_desc_n; ++j) {
if (interface != f->os_desc_table[j].if_id)
continue;
d = f->os_desc_table[j].os_desc;
if (d)
return min(res + d->ext_prop_len, 4096);
}
return res;
}
static int fill_ext_prop(struct usb_configuration *c, int interface, u8 *buf)
{
struct usb_function *f;
struct usb_os_desc *d;
struct usb_os_desc_ext_prop *ext_prop;
int j, count, n, ret;
f = c->interface[interface];
count = 10; /* header length */
buf += 10;
for (j = 0; j < f->os_desc_n; ++j) {
if (interface != f->os_desc_table[j].if_id)
continue;
d = f->os_desc_table[j].os_desc;
if (d)
list_for_each_entry(ext_prop, &d->ext_prop, entry) {
n = ext_prop->data_len +
ext_prop->name_len + 14;
if (count + n >= USB_COMP_EP0_OS_DESC_BUFSIZ)
return count;
usb_ext_prop_put_size(buf, n);
usb_ext_prop_put_type(buf, ext_prop->type);
ret = usb_ext_prop_put_name(buf, ext_prop->name,
ext_prop->name_len);
if (ret < 0)
return ret;
switch (ext_prop->type) {
case USB_EXT_PROP_UNICODE:
case USB_EXT_PROP_UNICODE_ENV:
case USB_EXT_PROP_UNICODE_LINK:
usb_ext_prop_put_unicode(buf, ret,
ext_prop->data,
ext_prop->data_len);
break;
case USB_EXT_PROP_BINARY:
usb_ext_prop_put_binary(buf, ret,
ext_prop->data,
ext_prop->data_len);
break;
case USB_EXT_PROP_LE32:
/* not implemented */
case USB_EXT_PROP_BE32:
/* not implemented */
default:
return -EINVAL;
}
buf += n;
count += n;
}
}
return count;
}
/*
* The setup() callback implements all the ep0 functionality that's
* not handled lower down, in hardware or the hardware driver(like
* device and endpoint feature flags, and their status). It's all
* housekeeping for the gadget function we're implementing. Most of
* the work is in config and function specific setup.
*/
int
composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
{
struct usb_composite_dev *cdev = get_gadget_data(gadget);
struct usb_request *req = cdev->req;
int value = -EOPNOTSUPP;
int status = 0;
u16 w_index = le16_to_cpu(ctrl->wIndex);
u8 intf = w_index & 0xFF;
u16 w_value = le16_to_cpu(ctrl->wValue);
u16 w_length = le16_to_cpu(ctrl->wLength);
struct usb_function *f = NULL;
u8 endp;
/* partial re-init of the response message; the function or the
* gadget might need to intercept e.g. a control-OUT completion
* when we delegate to it.
*/
req->zero = 0;
req->context = cdev;
req->complete = composite_setup_complete;
req->length = 0;
gadget->ep0->driver_data = cdev;
/*
* Don't let non-standard requests match any of the cases below
* by accident.
*/
if ((ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_STANDARD)
goto unknown;
switch (ctrl->bRequest) {
/* we handle all standard USB descriptors */
case USB_REQ_GET_DESCRIPTOR:
if (ctrl->bRequestType != USB_DIR_IN)
goto unknown;
switch (w_value >> 8) {
case USB_DT_DEVICE:
cdev->desc.bNumConfigurations =
count_configs(cdev, USB_DT_DEVICE);
cdev->desc.bMaxPacketSize0 =
cdev->gadget->ep0->maxpacket;
if (gadget_is_superspeed(gadget)) {
if (gadget->speed >= USB_SPEED_SUPER) {
cdev->desc.bcdUSB = cpu_to_le16(0x0320);
cdev->desc.bMaxPacketSize0 = 9;
} else {
cdev->desc.bcdUSB = cpu_to_le16(0x0210);
}
} else {
if (gadget->lpm_capable)
cdev->desc.bcdUSB = cpu_to_le16(0x0201);
else
cdev->desc.bcdUSB = cpu_to_le16(0x0200);
}
value = min(w_length, (u16) sizeof cdev->desc);
memcpy(req->buf, &cdev->desc, value);
break;
case USB_DT_DEVICE_QUALIFIER:
if (!gadget_is_dualspeed(gadget) ||
gadget->speed >= USB_SPEED_SUPER)
break;
device_qual(cdev);
value = min_t(int, w_length,
sizeof(struct usb_qualifier_descriptor));
break;
case USB_DT_OTHER_SPEED_CONFIG:
if (!gadget_is_dualspeed(gadget) ||
gadget->speed >= USB_SPEED_SUPER)
break;
/* FALLTHROUGH */
case USB_DT_CONFIG:
value = config_desc(cdev, w_value);
if (value >= 0)
value = min(w_length, (u16) value);
break;
case USB_DT_STRING:
value = get_string(cdev, req->buf,
w_index, w_value & 0xff);
if (value >= 0)
value = min(w_length, (u16) value);
break;
case USB_DT_BOS:
if (gadget_is_superspeed(gadget) ||
gadget->lpm_capable) {
value = bos_desc(cdev);
value = min(w_length, (u16) value);
}
break;
case USB_DT_OTG:
if (gadget_is_otg(gadget)) {
struct usb_configuration *config;
int otg_desc_len = 0;
if (cdev->config)
config = cdev->config;
else
config = list_first_entry(
&cdev->configs,
struct usb_configuration, list);
if (!config)
goto done;
if (gadget->otg_caps &&
(gadget->otg_caps->otg_rev >= 0x0200))
otg_desc_len += sizeof(
struct usb_otg20_descriptor);
else
otg_desc_len += sizeof(
struct usb_otg_descriptor);
value = min_t(int, w_length, otg_desc_len);
memcpy(req->buf, config->descriptors[0], value);
}
break;
}
break;
/* any number of configs can work */
case USB_REQ_SET_CONFIGURATION:
if (ctrl->bRequestType != 0)
goto unknown;
if (gadget_is_otg(gadget)) {
if (gadget->a_hnp_support)
DBG(cdev, "HNP available\n");
else if (gadget->a_alt_hnp_support)
DBG(cdev, "HNP on another port\n");
else
VDBG(cdev, "HNP inactive\n");
}
spin_lock(&cdev->lock);
value = set_config(cdev, ctrl, w_value);
spin_unlock(&cdev->lock);
break;
case USB_REQ_GET_CONFIGURATION:
if (ctrl->bRequestType != USB_DIR_IN)
goto unknown;
if (cdev->config)
*(u8 *)req->buf = cdev->config->bConfigurationValue;
else
*(u8 *)req->buf = 0;
value = min(w_length, (u16) 1);
break;
/* function drivers must handle get/set altsetting */
case USB_REQ_SET_INTERFACE:
if (ctrl->bRequestType != USB_RECIP_INTERFACE)
goto unknown;
if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
break;
f = cdev->config->interface[intf];
if (!f)
break;
/*
* If there's no get_alt() method, we know only altsetting zero
* works. There is no need to check if set_alt() is not NULL
* as we check this in usb_add_function().
*/
if (w_value && !f->get_alt)
break;
spin_lock(&cdev->lock);
value = f->set_alt(f, w_index, w_value);
if (value == USB_GADGET_DELAYED_STATUS) {
DBG(cdev,
"%s: interface %d (%s) requested delayed status\n",
__func__, intf, f->name);
cdev->delayed_status++;
DBG(cdev, "delayed_status count %d\n",
cdev->delayed_status);
}
spin_unlock(&cdev->lock);
break;
case USB_REQ_GET_INTERFACE:
if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE))
goto unknown;
if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
break;
f = cdev->config->interface[intf];
if (!f)
break;
/* lots of interfaces only need altsetting zero... */
value = f->get_alt ? f->get_alt(f, w_index) : 0;
if (value < 0)
break;
*((u8 *)req->buf) = value;
value = min(w_length, (u16) 1);
break;
case USB_REQ_GET_STATUS:
if (gadget_is_otg(gadget) && gadget->hnp_polling_support &&
(w_index == OTG_STS_SELECTOR)) {
if (ctrl->bRequestType != (USB_DIR_IN |
USB_RECIP_DEVICE))
goto unknown;
*((u8 *)req->buf) = gadget->host_request_flag;
value = 1;
break;
}
/*
* USB 3.0 additions:
* Function driver should handle get_status request. If such cb
* wasn't supplied we respond with default value = 0
* Note: function driver should supply such cb only for the
* first interface of the function
*/
if (!gadget_is_superspeed(gadget))
goto unknown;
if (ctrl->bRequestType != (USB_DIR_IN | USB_RECIP_INTERFACE))
goto unknown;
value = 2; /* This is the length of the get_status reply */
put_unaligned_le16(0, req->buf);
if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
break;
f = cdev->config->interface[intf];
if (!f)
break;
status = f->get_status ? f->get_status(f) : 0;
if (status < 0)
break;
put_unaligned_le16(status & 0x0000ffff, req->buf);
break;
/*
* Function drivers should handle SetFeature/ClearFeature
* (FUNCTION_SUSPEND) request. function_suspend cb should be supplied
* only for the first interface of the function
*/
case USB_REQ_CLEAR_FEATURE:
case USB_REQ_SET_FEATURE:
if (!gadget_is_superspeed(gadget))
goto unknown;
if (ctrl->bRequestType != (USB_DIR_OUT | USB_RECIP_INTERFACE))
goto unknown;
switch (w_value) {
case USB_INTRF_FUNC_SUSPEND:
if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
break;
f = cdev->config->interface[intf];
if (!f)
break;
value = 0;
if (f->func_suspend)
value = f->func_suspend(f, w_index >> 8);
if (value < 0) {
ERROR(cdev,
"func_suspend() returned error %d\n",
value);
value = 0;
}
break;
}
break;
default:
unknown:
/*
* OS descriptors handling
*/
if (cdev->use_os_string && cdev->os_desc_config &&
(ctrl->bRequestType & USB_TYPE_VENDOR) &&
ctrl->bRequest == cdev->b_vendor_code) {
struct usb_configuration *os_desc_cfg;
u8 *buf;
int interface;
int count = 0;
req = cdev->os_desc_req;
req->context = cdev;
req->complete = composite_setup_complete;
buf = req->buf;
os_desc_cfg = cdev->os_desc_config;
w_length = min_t(u16, w_length, USB_COMP_EP0_OS_DESC_BUFSIZ);
memset(buf, 0, w_length);
buf[5] = 0x01;
switch (ctrl->bRequestType & USB_RECIP_MASK) {
case USB_RECIP_DEVICE:
if (w_index != 0x4 || (w_value >> 8))
break;
buf[6] = w_index;
/* Number of ext compat interfaces */
count = count_ext_compat(os_desc_cfg);
buf[8] = count;
count *= 24; /* 24 B/ext compat desc */
count += 16; /* header */
put_unaligned_le32(count, buf);
value = w_length;
if (w_length > 0x10) {
value = fill_ext_compat(os_desc_cfg, buf);
value = min_t(u16, w_length, value);
}
break;
case USB_RECIP_INTERFACE:
if (w_index != 0x5 || (w_value >> 8))
break;
interface = w_value & 0xFF;
buf[6] = w_index;
count = count_ext_prop(os_desc_cfg,
interface);
put_unaligned_le16(count, buf + 8);
count = len_ext_prop(os_desc_cfg,
interface);
put_unaligned_le32(count, buf);
value = w_length;
if (w_length > 0x0A) {
value = fill_ext_prop(os_desc_cfg,
interface, buf);
if (value >= 0)
value = min_t(u16, w_length, value);
}
break;
}
goto check_value;
}
VDBG(cdev,
"non-core control req%02x.%02x v%04x i%04x l%d\n",
ctrl->bRequestType, ctrl->bRequest,
w_value, w_index, w_length);
/* functions always handle their interfaces and endpoints...
* punt other recipients (other, WUSB, ...) to the current
* configuration code.
*/
if (cdev->config) {
list_for_each_entry(f, &cdev->config->functions, list)
if (f->req_match &&
f->req_match(f, ctrl, false))
goto try_fun_setup;
} else {
struct usb_configuration *c;
list_for_each_entry(c, &cdev->configs, list)
list_for_each_entry(f, &c->functions, list)
if (f->req_match &&
f->req_match(f, ctrl, true))
goto try_fun_setup;
}
f = NULL;
switch (ctrl->bRequestType & USB_RECIP_MASK) {
case USB_RECIP_INTERFACE:
if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
break;
f = cdev->config->interface[intf];
break;
case USB_RECIP_ENDPOINT:
if (!cdev->config)
break;
endp = ((w_index & 0x80) >> 3) | (w_index & 0x0f);
list_for_each_entry(f, &cdev->config->functions, list) {
if (test_bit(endp, f->endpoints))
break;
}
if (&f->list == &cdev->config->functions)
f = NULL;
break;
}
try_fun_setup:
if (f && f->setup)
value = f->setup(f, ctrl);
else {
struct usb_configuration *c;
c = cdev->config;
if (!c)
goto done;
/* try current config's setup */
if (c->setup) {
value = c->setup(c, ctrl);
goto done;
}
/* try the only function in the current config */
if (!list_is_singular(&c->functions))
goto done;
f = list_first_entry(&c->functions, struct usb_function,
list);
if (f->setup)
value = f->setup(f, ctrl);
}
goto done;
}
check_value:
/* respond with data transfer before status phase? */
if (value >= 0 && value != USB_GADGET_DELAYED_STATUS) {
req->length = value;
req->context = cdev;
req->zero = value < w_length;
value = composite_ep0_queue(cdev, req, GFP_ATOMIC);
if (value < 0) {
DBG(cdev, "ep_queue --> %d\n", value);
req->status = 0;
composite_setup_complete(gadget->ep0, req);
}
} else if (value == USB_GADGET_DELAYED_STATUS && w_length != 0) {
WARN(cdev,
"%s: Delayed status not supported for w_length != 0",
__func__);
}
done:
/* device either stalls (value < 0) or reports success */
return value;
}
void composite_disconnect(struct usb_gadget *gadget)
{
struct usb_composite_dev *cdev = get_gadget_data(gadget);
unsigned long flags;
/* REVISIT: should we have config and device level
* disconnect callbacks?
*/
spin_lock_irqsave(&cdev->lock, flags);
if (cdev->config)
reset_config(cdev);
if (cdev->driver->disconnect)
cdev->driver->disconnect(cdev);
spin_unlock_irqrestore(&cdev->lock, flags);
}
/*-------------------------------------------------------------------------*/
static ssize_t suspended_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct usb_gadget *gadget = dev_to_usb_gadget(dev);
struct usb_composite_dev *cdev = get_gadget_data(gadget);
return sprintf(buf, "%d\n", cdev->suspended);
}
static DEVICE_ATTR_RO(suspended);
static void __composite_unbind(struct usb_gadget *gadget, bool unbind_driver)
{
struct usb_composite_dev *cdev = get_gadget_data(gadget);
struct usb_gadget_strings *gstr = cdev->driver->strings[0];
struct usb_string *dev_str = gstr->strings;
/* composite_disconnect() must already have been called
* by the underlying peripheral controller driver!
* so there's no i/o concurrency that could affect the
* state protected by cdev->lock.
*/
WARN_ON(cdev->config);
while (!list_empty(&cdev->configs)) {
struct usb_configuration *c;
c = list_first_entry(&cdev->configs,
struct usb_configuration, list);
remove_config(cdev, c);
}
if (cdev->driver->unbind && unbind_driver)
cdev->driver->unbind(cdev);
composite_dev_cleanup(cdev);
if (dev_str[USB_GADGET_MANUFACTURER_IDX].s == cdev->def_manufacturer)
dev_str[USB_GADGET_MANUFACTURER_IDX].s = "";
kfree(cdev->def_manufacturer);
kfree(cdev);
set_gadget_data(gadget, NULL);
}
static void composite_unbind(struct usb_gadget *gadget)
{
__composite_unbind(gadget, true);
}
static void update_unchanged_dev_desc(struct usb_device_descriptor *new,
const struct usb_device_descriptor *old)
{
__le16 idVendor;
__le16 idProduct;
__le16 bcdDevice;
u8 iSerialNumber;
u8 iManufacturer;
u8 iProduct;
/*
* these variables may have been set in
* usb_composite_overwrite_options()
*/
idVendor = new->idVendor;
idProduct = new->idProduct;
bcdDevice = new->bcdDevice;
iSerialNumber = new->iSerialNumber;
iManufacturer = new->iManufacturer;
iProduct = new->iProduct;
*new = *old;
if (idVendor)
new->idVendor = idVendor;
if (idProduct)
new->idProduct = idProduct;
if (bcdDevice)
new->bcdDevice = bcdDevice;
else
new->bcdDevice = cpu_to_le16(get_default_bcdDevice());
if (iSerialNumber)
new->iSerialNumber = iSerialNumber;
if (iManufacturer)
new->iManufacturer = iManufacturer;
if (iProduct)
new->iProduct = iProduct;
}
int composite_dev_prepare(struct usb_composite_driver *composite,
struct usb_composite_dev *cdev)
{
struct usb_gadget *gadget = cdev->gadget;
int ret = -ENOMEM;
/* preallocate control response and buffer */
cdev->req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
if (!cdev->req)
return -ENOMEM;
cdev->req->buf = kmalloc(USB_COMP_EP0_BUFSIZ, GFP_KERNEL);
if (!cdev->req->buf)
goto fail;
ret = device_create_file(&gadget->dev, &dev_attr_suspended);
if (ret)
goto fail_dev;
cdev->req->complete = composite_setup_complete;
cdev->req->context = cdev;
gadget->ep0->driver_data = cdev;
cdev->driver = composite;
/*
* As per USB compliance update, a device that is actively drawing
* more than 100mA from USB must report itself as bus-powered in
* the GetStatus(DEVICE) call.
*/
if (CONFIG_USB_GADGET_VBUS_DRAW <= USB_SELF_POWER_VBUS_MAX_DRAW)
usb_gadget_set_selfpowered(gadget);
/* interface and string IDs start at zero via kzalloc.
* we force endpoints to start unassigned; few controller
* drivers will zero ep->driver_data.
*/
usb_ep_autoconfig_reset(gadget);
return 0;
fail_dev:
kfree(cdev->req->buf);
fail:
usb_ep_free_request(gadget->ep0, cdev->req);
cdev->req = NULL;
return ret;
}
int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
struct usb_ep *ep0)
{
int ret = 0;
cdev->os_desc_req = usb_ep_alloc_request(ep0, GFP_KERNEL);
if (!cdev->os_desc_req) {
ret = -ENOMEM;
goto end;
}
cdev->os_desc_req->buf = kmalloc(USB_COMP_EP0_OS_DESC_BUFSIZ,
GFP_KERNEL);
if (!cdev->os_desc_req->buf) {
ret = -ENOMEM;
usb_ep_free_request(ep0, cdev->os_desc_req);
goto end;
}
cdev->os_desc_req->context = cdev;
cdev->os_desc_req->complete = composite_setup_complete;
end:
return ret;
}
void composite_dev_cleanup(struct usb_composite_dev *cdev)
{
struct usb_gadget_string_container *uc, *tmp;
struct usb_ep *ep, *tmp_ep;
list_for_each_entry_safe(uc, tmp, &cdev->gstrings, list) {
list_del(&uc->list);
kfree(uc);
}
if (cdev->os_desc_req) {
if (cdev->os_desc_pending)
usb_ep_dequeue(cdev->gadget->ep0, cdev->os_desc_req);
kfree(cdev->os_desc_req->buf);
usb_ep_free_request(cdev->gadget->ep0, cdev->os_desc_req);
}
if (cdev->req) {
if (cdev->setup_pending)
usb_ep_dequeue(cdev->gadget->ep0, cdev->req);
kfree(cdev->req->buf);
usb_ep_free_request(cdev->gadget->ep0, cdev->req);
}
cdev->next_string_id = 0;
device_remove_file(&cdev->gadget->dev, &dev_attr_suspended);
/*
* Some UDC backends have a dynamic EP allocation scheme.
*
* In that case, the dispose() callback is used to notify the
* backend that the EPs are no longer in use.
*
* Note: The UDC backend can remove the EP from the ep_list as
* a result, so we need to use the _safe list iterator.
*/
list_for_each_entry_safe(ep, tmp_ep,
&cdev->gadget->ep_list, ep_list) {
if (ep->ops->dispose)
ep->ops->dispose(ep);
}
}
static int composite_bind(struct usb_gadget *gadget,
struct usb_gadget_driver *gdriver)
{
struct usb_composite_dev *cdev;
struct usb_composite_driver *composite = to_cdriver(gdriver);
int status = -ENOMEM;
cdev = kzalloc(sizeof *cdev, GFP_KERNEL);
if (!cdev)
return status;
spin_lock_init(&cdev->lock);
cdev->gadget = gadget;
set_gadget_data(gadget, cdev);
INIT_LIST_HEAD(&cdev->configs);
INIT_LIST_HEAD(&cdev->gstrings);
status = composite_dev_prepare(composite, cdev);
if (status)
goto fail;
/* composite gadget needs to assign strings for whole device (like
* serial number), register function drivers, potentially update
* power state and consumption, etc
*/
status = composite->bind(cdev);
if (status < 0)
goto fail;
if (cdev->use_os_string) {
status = composite_os_desc_req_prepare(cdev, gadget->ep0);
if (status)
goto fail;
}
update_unchanged_dev_desc(&cdev->desc, composite->dev);
/* has userspace failed to provide a serial number? */
if (composite->needs_serial && !cdev->desc.iSerialNumber)
WARNING(cdev, "userspace failed to provide iSerialNumber\n");
INFO(cdev, "%s ready\n", composite->name);
return 0;
fail:
__composite_unbind(gadget, false);
return status;
}
/*-------------------------------------------------------------------------*/
void composite_suspend(struct usb_gadget *gadget)
{
struct usb_composite_dev *cdev = get_gadget_data(gadget);
struct usb_function *f;
/* REVISIT: should we have config level
* suspend/resume callbacks?
*/
DBG(cdev, "suspend\n");
if (cdev->config) {
list_for_each_entry(f, &cdev->config->functions, list) {
if (f->suspend)
f->suspend(f);
}
}
if (cdev->driver->suspend)
cdev->driver->suspend(cdev);
cdev->suspended = 1;
usb_gadget_vbus_draw(gadget, 2);
}
void composite_resume(struct usb_gadget *gadget)
{
struct usb_composite_dev *cdev = get_gadget_data(gadget);
struct usb_function *f;
u16 maxpower;
/* REVISIT: should we have config level
* suspend/resume callbacks?
*/
DBG(cdev, "resume\n");
if (cdev->driver->resume)
cdev->driver->resume(cdev);
if (cdev->config) {
list_for_each_entry(f, &cdev->config->functions, list) {
if (f->resume)
f->resume(f);
}
maxpower = cdev->config->MaxPower;
usb_gadget_vbus_draw(gadget, maxpower ?
maxpower : CONFIG_USB_GADGET_VBUS_DRAW);
}
cdev->suspended = 0;
}
/*-------------------------------------------------------------------------*/
static const struct usb_gadget_driver composite_driver_template = {
.bind = composite_bind,
.unbind = composite_unbind,
.setup = composite_setup,
.reset = composite_disconnect,
.disconnect = composite_disconnect,
.suspend = composite_suspend,
.resume = composite_resume,
.driver = {
.owner = THIS_MODULE,
},
};
/**
* usb_composite_probe() - register a composite driver
* @driver: the driver to register
*
* Context: single threaded during gadget setup
*
* This function is used to register drivers using the composite driver
* framework. The return value is zero, or a negative errno value.
* Those values normally come from the driver's @bind method, which does
* all the work of setting up the driver to match the hardware.
*
* On successful return, the gadget is ready to respond to requests from
* the host, unless one of its components invokes usb_gadget_disconnect()
* while it was binding. That would usually be done in order to wait for
* some userspace participation.
*/
int usb_composite_probe(struct usb_composite_driver *driver)
{
struct usb_gadget_driver *gadget_driver;
if (!driver || !driver->dev || !driver->bind)
return -EINVAL;
if (!driver->name)
driver->name = "composite";
driver->gadget_driver = composite_driver_template;
gadget_driver = &driver->gadget_driver;
gadget_driver->function = (char *) driver->name;
gadget_driver->driver.name = driver->name;
gadget_driver->max_speed = driver->max_speed;
return usb_gadget_probe_driver(gadget_driver);
}
EXPORT_SYMBOL_GPL(usb_composite_probe);
/**
* usb_composite_unregister() - unregister a composite driver
* @driver: the driver to unregister
*
* This function is used to unregister drivers using the composite
* driver framework.
*/
void usb_composite_unregister(struct usb_composite_driver *driver)
{
usb_gadget_unregister_driver(&driver->gadget_driver);
}
EXPORT_SYMBOL_GPL(usb_composite_unregister);
/**
* usb_composite_setup_continue() - Continue with the control transfer
* @cdev: the composite device who's control transfer was kept waiting
*
* This function must be called by the USB function driver to continue
* with the control transfer's data/status stage in case it had requested to
* delay the data/status stages. A USB function's setup handler (e.g. set_alt())
* can request the composite framework to delay the setup request's data/status
* stages by returning USB_GADGET_DELAYED_STATUS.
*/
void usb_composite_setup_continue(struct usb_composite_dev *cdev)
{
int value;
struct usb_request *req = cdev->req;
unsigned long flags;
DBG(cdev, "%s\n", __func__);
spin_lock_irqsave(&cdev->lock, flags);
if (cdev->delayed_status == 0) {
WARN(cdev, "%s: Unexpected call\n", __func__);
} else if (--cdev->delayed_status == 0) {
DBG(cdev, "%s: Completing delayed status\n", __func__);
req->length = 0;
req->context = cdev;
value = composite_ep0_queue(cdev, req, GFP_ATOMIC);
if (value < 0) {
DBG(cdev, "ep_queue --> %d\n", value);
req->status = 0;
composite_setup_complete(cdev->gadget->ep0, req);
}
}
spin_unlock_irqrestore(&cdev->lock, flags);
}
EXPORT_SYMBOL_GPL(usb_composite_setup_continue);
static char *composite_default_mfr(struct usb_gadget *gadget)
{
return kasprintf(GFP_KERNEL, "%s %s with %s", init_utsname()->sysname,
init_utsname()->release, gadget->name);
}
void usb_composite_overwrite_options(struct usb_composite_dev *cdev,
struct usb_composite_overwrite *covr)
{
struct usb_device_descriptor *desc = &cdev->desc;
struct usb_gadget_strings *gstr = cdev->driver->strings[0];
struct usb_string *dev_str = gstr->strings;
if (covr->idVendor)
desc->idVendor = cpu_to_le16(covr->idVendor);
if (covr->idProduct)
desc->idProduct = cpu_to_le16(covr->idProduct);
if (covr->bcdDevice)
desc->bcdDevice = cpu_to_le16(covr->bcdDevice);
if (covr->serial_number) {
desc->iSerialNumber = dev_str[USB_GADGET_SERIAL_IDX].id;
dev_str[USB_GADGET_SERIAL_IDX].s = covr->serial_number;
}
if (covr->manufacturer) {
desc->iManufacturer = dev_str[USB_GADGET_MANUFACTURER_IDX].id;
dev_str[USB_GADGET_MANUFACTURER_IDX].s = covr->manufacturer;
} else if (!strlen(dev_str[USB_GADGET_MANUFACTURER_IDX].s)) {
desc->iManufacturer = dev_str[USB_GADGET_MANUFACTURER_IDX].id;
cdev->def_manufacturer = composite_default_mfr(cdev->gadget);
dev_str[USB_GADGET_MANUFACTURER_IDX].s = cdev->def_manufacturer;
}
if (covr->product) {
desc->iProduct = dev_str[USB_GADGET_PRODUCT_IDX].id;
dev_str[USB_GADGET_PRODUCT_IDX].s = covr->product;
}
}
EXPORT_SYMBOL_GPL(usb_composite_overwrite_options);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Brownell");